On Wed, Aug 22, 2007 at 11:32:11AM -0700, Andrew Morton wrote: > > On Wed, 22 Aug 2007 02:06:48 -0700 Andrew Morton wrote: > > > > > > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23-rc3/2.6.23-rc3-mm1/ > > > > allyesconfig on x86_64 says: > > > > kernel/unwind.c:1016:31: error: undefined identifier '__builtin_labs' > > kernel/unwind.c:1232:25: error: undefined identifier '__builtin_labs' > > >
Why does that compiler not know __builtin_abs? > One wonders why x86_64-mm-unwinder.patch has an open-coded call to > __builtin_labs(), when include/linux/kernel.h:abs() should do a fine job. I'll fix. > > And what's this stuff, anyway? > > +typedef unsigned long uleb128_t; > +typedef signed long sleb128_t; > +#define sleb128abs __builtin_labs > > unsigned and signed little-endian 128-bit types? Nope, they're 32-bit or > 64-bit. All very mysterious. dwarf2 uses a magic compressing encoding for numbers that uses less bytes for small numbers and more bytes for larger numbers. These are the base types for this. It's similar to fs/reiser4/dscale.h in your tree. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
